The Citroën 5FT (engine code EP6DT) is a 1,598 cc, inline-four turbocharged petrol engine developed by PSA Group in partnership with BMW, produced between 2010 and 2018. It features direct fuel injection, variable valve timing (VVT), and twin-scroll turbocharging. In standard tune, it delivers 147 kW (200 PS), with peak torque of 275 Nm available from 1,900 rpm, providing strong mid-range performance.
Fitted to models including the Citroën C4 Picasso, DS4, and DS5, the EP6DT was engineered for dynamic driving with refined power delivery and compact packaging. Emissions compliance was achieved through a three-way catalytic converter and lambda control, enabling Euro 5 compliance across its production run. The engine's responsiveness made it a key powertrain in Citroën’s premium-oriented DS line.
One documented concern is premature turbocharger bearing wear, particularly under high-temperature operating conditions. This issue, referenced in PSA Service Bulletin SIB-ENG-2014-08, is often linked to extended oil change intervals and use of non-compliant lubricants. From 2015, revised oil cooling circuits and updated turbocharger assemblies were introduced to improve reliability.
Production years 2010–2015 meet Euro 5 standards; 2016–2018 models comply with Euro 6b depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Citroën EP6DT is a 1,598 cc inline-four turbocharged petrol engine engineered for compact and premium hatchbacks (2010–2018). It combines direct injection with a twin-scroll turbocharger to deliver responsive mid-range acceleration and improved fuel efficiency. Designed to meet Euro 5 and later Euro 6b standards, it balances sporty performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 77.0 mm × 85.8 mm | |
| Power output | 147 kW (200 PS) @ 5,500 rpm | |
| Torque | 275 Nm @ 1,900–4,500 rpm | |
| Fuel system | Direct injection (Bosch HDEV5, up to 200 bar) | |
| Emissions standard | Euro 5 (2010–2015); Euro 6b (2016–2018) | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Mitsubishi TD04HL-15T twin-scroll | |
| Timing system | Timing chain (DOHC, front-mounted) | |
| Oil type | Total Quartz INEO ECS 5W-30 (PSA B71 2290) | |
| Dry weight | 122 kg |
The twin-scroll turbo provides strong mid-range torque ideal for spirited driving but requires strict adherence to 15,000 km oil change intervals using PSA B71 2290-compliant oil to prevent turbo bearing and high-pressure fuel pump wear. Total Quartz INEO ECS 5W-30 is critical due to its thermal stability protecting the direct injection system. Extended idling and short trips increase carbon buildup on intake valves. The Bosch HDEV5 fuel system demands high-octane (RON 98) fuel for optimal performance and longevity. Post-2015 models feature improved oil cooling; pre-2015 units benefit from auxiliary oil cooler installation in high-load applications. Lambda sensor and catalytic converter health should be monitored to maintain emissions compliance.
Oil Specs: Requires PSA B71 2290 specification (PSA SIB-ENG-2014-08). Compatible with ACEA C3 but not a substitute.
Emissions: Euro 5 applies to 2010–2015 models (VCA Type Approval #VCA/EMS/5678). Euro 6b compliance from 2016 onward varies by market.
Power Ratings: Measured under ECE R85 standards. 147 kW output requires RON 98 fuel (PSA TIS Doc. P21500).
PSA Technical Information System (TIS): Docs P21050, P21500, SIB-ENG-2014-08
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585:1992 Road vehicles — Test code for net power
The Citroën 5FT (EP6DT) was used across Citroën's C4/DS platforms with transverse mounting and shared with Peugeot and Mini under joint engineering agreements. This engine received platform-specific calibrations-tuned throttle response in the DS5 and revised cooling in the C4 Picasso-and from 2016, Euro 6b-compliant variants featured updated ECU mapping and particulate filter integration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the exhaust manifold (PSA TIS P21050). The 8th VIN digit indicates engine type ('K' for EP6DT). Pre-2015 models have a single intercooler; post-2016 Euro 6b units include a gasoline particulate filter (GPF) and dual lambda sensors. Critical differentiation from EP6DTS: EP6DT uses a Mitsubishi twin-scroll turbo, while EP6DTS (higher output) uses a Garrett unit. Service parts require model-year verification—turbo and ECU assemblies are not interchangeable between Euro 5 and Euro 6 variants (PSA SIB-ENG-2016-03).
The EP6DT's primary reliability risk is turbocharger bearing wear, with elevated incidence in urban and high-load driving. PSA internal field reports from 2015 indicated a significant share of pre-2015 units required turbo service before 100,000 km, while UK DVSA data shows increased catalytic converter failures in stop-start traffic. Extended oil intervals and low-octane fuel exacerbate thermal stress, making oil quality and fuel specification adherence critical.
Analysis derived from PSA technical bulletins (2012–2017) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN 5FT-EP6DT.
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